digraph Syzygy {
  KQRvKN -> KRvKN;
  KQRvKN -> KQvKN;
  KQRvKN -> KQRvK;
  KQRvK -> KRvK;
  KQRvK -> KQvK;
  KQvKN -> KNvK;
  KQvKN -> KQvK;
  KRvKN -> KNvK;
  KRvKN -> KRvK;
}